Screen



April 21, 1925.

R. H. BEAUMONT SCREEN 3 Sheets-Sheet l Filed May 1, 1923 R. EEUMONT SCREEN 3 Sheets-Sheet 2 Filed May-1, 1923 O @GOO Q O OO O OOO mi@ 2L, $1925 R. H. BEAUM'GNT SCREEN 3 Sheets-Sheet 5 Patented Apr. 21, 1925.

ROBERT E. BEAUMONT, 0F PHILADELPHIA, PENNSYLVANIA, ASSIGNOB TO B. Hai

BEAUMONT COMPANY, OF PHILADELPHIA, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA.

application` med may i,

To all whom it may concern:

Be it known that I, ROBERT H. BEAUMONT, a citizen of the United States, residing in Philadelphia, Pennsylvania, have invented a Screen, ofwhich the following is a specification.

My invention-relates to vibrating screens, having particular-relation to such screens as are adaptedto separate coal.

Anv important object of my invention is to provide a vbalanced vibrating screen,

wherein the usual undesirable mechanical' vibration ofthe supporting `structure for thel screen, incident to the operation of the screen, is substantially eliminated.

Another object of my invention is to pro; vide an adjustable spring `support for resiliently mounting the movable screen mem- 1 bers which is characterized by its simplicity of design and construction.

According to my invention, I provide a 'combination comprising a pair of superposed horizontally extendingscreens which are mounted on inclined spring supports having adjusting" means for varying the` force of the springsy to correspondingly vary the natural period ofl vibration of the screens. A crank-shaft mechanism' having connecting rods secured to the screens is employed for driving the same, theconnecting rods being positioned."substantially at t e supporting spring members so that the screen may be given vertical as welll as yhorizontal components of motion. My invention is further characterized by the discovery' thatthe undesirable mechani- 7 cal vibration, incident to the o erationof the foregoin apparatus, may tially avoide by establishing a relation between the vibrational frequency of the screen and that of the impulses applied thereto ,by the driving mechanism, all as `will appeary more fully hereinafter.

With these and other objects and appli- .y

cations in view, myinvention further consists in the details of construction and `operation hereinafter described and claimed and illustratedin the accompanying drawing, whereinw vFig. lis a side elevational view of one e substan-n 1923. Serial No. 635,953.

tiona fragmentary view taken on the linev V--V of Fig. 4.

In the illustrated form 0f embodiment of my invention shown in the drawing, a pair of superposed horizontally extending screen members 1 and 2comprise perforated base portions 3 and 4 and Aopposite sidewall portions 5 and 6, respectively. The screen members 1 and'2- are resiliently supported from the opposite side portions 5, 6 and 7,

V8 thereofby inclined spring legst), 10 and 11, 12, respectively, which are mounted onv apair efsu porting side'members 13 and 14.7: The spring legs com rise a plurality of fiat stri s of exible stee orother resilient materia 4forming y a laminated structure which increases in thickness from the center to the ends thereof. The upper ends ofthe flexible strips are rigidly positioned intermediate aw plates 15 and 16 of bracket members 17 which are mounted on the side portions of the screen members 1 and 2, r'espectively.

The several spring members su orting the screens 1 and 2 extenddownwardly from the bracket members 17 in an inclined direction toward the supporting side members 13 and 14 and are secured at their. lower ends` to upwardly extending inclined flange members 18 and 19 thereof. The upper end por- -tions of `the flanges 18 and 19 are provided with threaded perforations to receive ady justingscrews 22 having corresponding ends 'thereof in engagement with the'datv sides of the sprin supporting' legs, whereby forcel ofl t e spring legs may be varied to adjust the natural vibrational frequency of the screen members l--and 2te a desired the woA

opposite ends connected, respectively, to.

bearing rods 25 and 26 on the ends of the screens 1 and 2, and-to oppositely disposed cranks 27 and 28 of a crank-shaft 29. Experiment has shown that the hereindescribed construction, wherein thescreenin apparatus is dividedl into two parts andt e cranks v of the driving crank-shaft mechanism disposed 180 apartjeffects a material reducf 'tion in the undesirable mechanical vibration incident to the' operation of the screen apparatus. The opposite ends of the cranks hafft 29 may be supported in bearings 31 and 32, formed in pedestals 33 and 34 constituting extensions of said .side members 13 and 14. One end of .the crank-shaft 29 may be' extended beyond the bearing 31 to provide a support for a fly wheel 35.v The other end ofthe crank-shaft 29 is similarly extended to provide a support for a gear wheel 36 which is operatively, associated with a source of energy (not shown).

When power is supplied tothe crankshaft mechanism and the Yconnecting rods 23 and 24C, which are mountedsubstantially at; right anglesv tothe supporting spring legs, oppositely reciprocated, the screen members l and 2 are correspondingly reciprocated in a direction which isinclined to thejhorizontal. The vertical component of this motion lserves the double purpose of preventing the ,material in the `screens from lacking. or

blinding the screen" holes, and also imparts a so-called jig action which drives the larger and heavierparticles to the surface of the mass and-allows the finer particlesto' pass through the mesh of the screen. The

horizontal component ofthe screen motion serves to propel the material forward on the screen. For purposes of illustration, a hopper 37 is shown at the forwardend of the screens Vfor receiving the over-size material, while a hopper 38 is shown beneath the screens 1 and 2 for receivingthe iner material'directly passing through the same.

As hereinbefore stated, I have found .that if the screen apparatus is so designed that .its natural period of'vibration corresponds with the speed at which it is driven by the crank-shaft mechanism, substantially all the undesirable mechanical vibration incident to the reciprocal movement of the screen members 1 and 2 is avoidedl Accordingly, in operation, 4the force of the supporting spring legs is adjusted by the screw member 22,-to the point where the vibration-of the screen members resulting from a sudden force corresponds with the speed at which they are driven.

of my invention, I desire, therefore, thatv only such limitations shall "be imposed thereon as are indicated in the appended claims or as are demanded by the prior art.

I claim: 1. In combination, a screen member, a base member, means vfor resiliently mounting one of said members on the other comprising a bracket member rigidly secured to said screen member, a spring member having one end Asecured to said bracket member and extending toward said base member,

said last-mentioned member having an upwardly extending ange portion, the remaining end ofsaid spring member being secured to' said iange portion, and adjusting means carried by said base member co operating with said spring member, whereby the force of the `spring member may be varied. f

2. In combination, a screen member, a supporting lmember having flange portion, a springL member having opposite ends, a bracket mounted on said screen member and rigidly'secured to one end of- Said spring member, the remaining end of said s ring member being rigidly secured to said ange portion, and an adjustable screw member also carried by said angeportion for varyby the vibrational frequency of said screen member may be adjusted to ai desired value.,

3. .In combination, a screen member having opposite sides, a pair of spring members having their upper vends secured `respectively to said opposite sides, a pair of supporting members positioned onv opposite sides of said screen member and provided with flangel portions, means for securing the lower ends of said spring members to the flange portions of' yadjacent supporting members, and means also carried by said supporting members for varying the tension o f the spring members, whereby the vibra-v tional frequency of said screen member may be adjusted to a desired value.

4, In combination, a screen having o posite sides, a rpair ofjsprings respectively secured to said opposite sides, a pair of su portin members positioned on opposite si es of sai `screen and provided: Withfi'iange portions, meansfor respectively securi said springs to the flange portions of adjacent supporting members, means also carried by said supporting members for yarying the tension of saidspringaa second screen and driving mechanism comprising a driving Meissen shaft and connecting reds adapted te be oppositely reeiproeate by said shaft and operatively associated, respectively, With said screens7 said side members being 5 formed to constitute healing `pelesta-ls for said driving shaft.

5. ln combination, a screen, a supporting member provided with a iange, a spring secured to said screen and said iange, and means extending between said flange and saidspring for adjusting the force of the latter.

RGBERT H. BEAUMGNT. 

